If you have your database server running on a different port the setup doesn't work. Changing the setup.cfm to extract the port number from the string "server:port" and adding dsn.port to the addCFdatasource.cfm template will fix this.

<cfif listLen(form.server_new,":") eq 2>
<cfset dsn.port = listLast(form.server_new,":") />
<cfelse>
<cfset dsn.port = listLast(form.server_new,":") />
</cfif>